plumiHow are the amounts of chemicals in solution measured?: OCR GCSE Combined Science B questions
Every OCR GCSE Combined Science B exam question on C5.3 How are the amounts of chemicals in solution measured?, 2018–2025, with its mark scheme and examiner’s report.
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Calculations
Q6(a)
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Q6(b)(i)
The whole paper ↗Q6(b)(ii)
The whole paper ↗Q6(b)(iii)
The whole paper ↗Q3(b)(ii)
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Q3(c)(i)
The whole paper ↗Q3(c)(ii)
The whole paper ↗Q6(c)(i)
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Q3(c)
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Q3(d)
The whole paper ↗Q3(e)(i)
The whole paper ↗Q3(e)(ii)
The whole paper ↗Q4(c)(i)
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Q4(c)(ii)
The whole paper ↗Q4(c)(iii)
The whole paper ↗Q4(d)(i)
The whole paper ↗Q4(d)(ii)
The whole paper ↗Q4(d)(iii)
The whole paper ↗Q8(b)
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Q8(c)(ii)
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All 39 questions on How are the amounts of chemicals in solution measured?, as a list
- June 2024, Chemistry Paper 6 Higher, Q6(a) (6 marks): A student wants to find the concentration of a sodium hydroxide solution. They do a titration using sodium hydroxide solution and 0.010 mol / dm3 dilute hydroch
- June 2024, Chemistry Paper 6 Higher, Q6(b)(i) (1 mark): Why is the first reading much higher than the others? [1]
- June 2024, Chemistry Paper 6 Higher, Q6(b)(ii) (3 marks): Calculate the mean volume of acid which reacts with the sodium hydroxide solution. Give your answer to 1 decimal place. Mean volume of acid = cm3 [3]
- June 2024, Chemistry Paper 6 Higher, Q6(b)(iii) (2 marks): The student’s teacher states that the volume of the hydrochloric acid needed to react with the sodium hydroxide should be 25.8 cm3. Explain what the student’s r
- June 2023, Chemistry Paper 2 Foundation, Q3(b)(ii) (2 marks): Felix uses the method to get a rough idea of the volume of acid needed. He makes changes to the method to improve the quality of his data. Draw lines to connect
- June 2023, Chemistry Paper 2 Foundation, Q3(c)(i) (1 mark): Complete the sentence to evaluate the quality of his repeated results. Put a ring around each correct option. These results are high / low quality because the r
- June 2023, Chemistry Paper 2 Foundation, Q3(c)(ii) (3 marks): Calculate the mean of the repeated results. Give your answer to 1 decimal place. Mean = cm3 [3]
- June 2023, Chemistry Paper 6 Higher, Q6(c)(i) (3 marks): Calculate the number of moles of sulfuric acid used. Use the formula: concentration (mol / dm3) = number of moles volume (dm3) Number of moles of sulfuric acid
- June 2022, Chemistry Paper 2 Foundation, Q3(c) (1 mark): Milk of magnesia is a medicine used to neutralise excess acid in the stomach. Milk of Magnesia One 15 cm3 spoonful contains 1200 mg of magnesium hydroxide. Leo
- June 2022, Chemistry Paper 2 Foundation, Q3(d) (1 mark): Leo decides to measure the acid with a more accurate piece of apparatus instead of the measuring cylinder. Which piece of apparatus should he use? Put a ring ar
- June 2022, Chemistry Paper 2 Foundation, Q3(e)(i) (2 marks): Calculate the mean volume of acid used. Mean volume of acid used = cm3 [2]
- June 2022, Chemistry Paper 2 Foundation, Q3(e)(ii) (3 marks): The label says that there is 1200 mg of magnesium hydroxide in one 15 cm3 spoonful. Calculate the volume of hydrochloric acid needed to react with the magnesium
- June 2022, Chemistry Paper 6 Higher, Q4(c)(i) (3 marks): Calculate the range of the mass of sodium hydroxide expected in 3 g of oven cleaner. Use information from the label. Mass of sodium hydroxide is from g to < g [
- June 2022, Chemistry Paper 6 Higher, Q4(c)(ii) (1 mark): How does Sam know when all the sodium hydroxide has reacted? [1]
- June 2022, Chemistry Paper 6 Higher, Q4(c)(iii) (1 mark): Sam wants to measure the exact volume of acid needed for all of the sodium hydroxide to react. Describe one thing Sam should do so that the titration result is
- June 2022, Chemistry Paper 6 Higher, Q4(d)(i) (3 marks): Calculate the number of moles of hydrochloric acid in 24.8 cm3 of 0.25 mol / dm3. Use the formula: concentration (mol / dm3) = number of moles of solute volume
- June 2022, Chemistry Paper 6 Higher, Q4(d)(ii) (1 mark): Find out how many moles of sodium hydroxide react with this amount of acid. Use the symbol equation: NaOH(aq) + HCl (aq) NaCl (aq) + H2O(l) Number of moles of s
- June 2022, Chemistry Paper 6 Higher, Q4(d)(iii) (3 marks): Calculate the mass of sodium hydroxide (NaOH) reacting with the acid. Use the formula and the relative atomic masses given. mass of substance (g) number of mole
- November 2021, Chemistry Paper 2 Foundation, Q8(b) (2 marks): Jamal adds water and indicator to one tablet in a conical flask. He then adds the acid to the conical flask from a burette until all of the magnesium hydroxide
- November 2021, Chemistry Paper 2 Foundation, Q8(c)(ii) (2 marks): Jamal finds that 10.2 cm3 of acid reacts with one tablet. He uses this formula to find the mass of magnesium hydroxide in one tablet: Mass of relative formula v
- November 2021, Chemistry Paper 2 Foundation, Q8(d) (2 marks): The tablets are sold in packs of 100 tablets. Jamal tests five tablets from three packs of tablets, Pack A, Pack B and Pack C. Table 8.1 shows his results. Mass
- November 2021, Chemistry Paper 6 Higher, Q9(a)(i) (2 marks): Give two errors that Kareem has made when recording his results in the table. 1 2 [2]
- November 2021, Chemistry Paper 6 Higher, Q9(a)(ii) (1 mark): Why is the volume of acid added for the repeat readings less than that added in the rough trial? [1]
- November 2021, Chemistry Paper 6 Higher, Q9(a)(iii) (2 marks): Kareem decided that the most accurate value for the volume of acid added was 23.5 cm3. Explain how he calculated this value. [2]
- November 2021, Chemistry Paper 6 Higher, Q9(b)(i) (3 marks): Calculate the mass of sodium hydroxide in 25.0 cm3 of the 8.0 g / dm3 solution. mass (g) Use the formula: concentration (g / dm3) = volume (dm3) Mass = g [3]
- November 2021, Chemistry Paper 6 Higher, Q9(b)(ii) (3 marks): Show that the number of moles of sulfuric acid reacting with the sodium hydroxide is 0.0025. Use your answer to (b)(i). mass of substance (g) Use the formula: n
- November 2021, Chemistry Paper 6 Higher, Q9(b)(iii) (3 marks): Calculate the concentration of the sulfuric acid, in mol / dm3. Give your answer to 2 significant figures. number of moles Use the formula: concentration (mol /
- November 2020, Combined Science Paper 8 Higher, Q6(a) (4 marks): Mia’s teacher says that she can improve the procedure for both stage 1 and stage 2 of this experiment. State one improvement for each stage of this experiment,
- November 2020, Combined Science Paper 8 Higher, Q6(b) (3 marks): Outline the rest of the procedure to titrate the white vinegar with an alkali solution to obtain accurate and precise results. [3]
- November 2020, Combined Science Paper 8 Higher, Q6(c) (3 marks): Mia does the titration six times, and her results are shown in the table. Titration Titration Titration Titration Titration Titration 1 2 3 4 5 6 Burette readin
- November 2020, Combined Science Paper 8 Higher, Q6(d) (4 marks): Mia calculates that 25.0 cm3 of the white vinegar contains 0.026 moles of ethanoic acid. The relative formula mass of ethanoic acid is 60.0. The density of etha
- June 2018, Chemistry Paper 2 Foundation, Q8(a) (1 mark): What type of reaction happens when the acid reacts with the alkali? Put a ring around the correct answer. Crystallisation Neutralisation Oxidation Precipitation
- June 2018, Chemistry Paper 2 Foundation, Q8(b) (2 marks): Here are some statements about the steps needed to do a titration. They are not in the correct order. A Add an indicator. Measure out exactly 25.0 cm3 of alkali
- June 2018, Chemistry Paper 2 Foundation, Q8(c)(i) (1 mark): Which is the best apparatus to use to measure out exactly 25.0 cm3 of alkali into a conical flask? Put a ring around the correct answer. Burette Graduated beake
- June 2018, Chemistry Paper 2 Foundation, Q8(c)(ii) (1 mark): Which is the best apparatus to use to accurately measure out the amount of acid needed to react with the alkali? Put a ring around the correct answer. Burette G
- June 2018, Chemistry Paper 2 Foundation, Q8(d)(i) (2 marks): Jamal does a rough trial before he does his repeat titrations. Explain how he uses the result of his rough trial to help him to do his repeat titrations. [2]
- June 2018, Chemistry Paper 2 Foundation, Q8(d)(ii) (1 mark): Jamal ignores his rough trial when he processes his results. What is the range of the results of Jamal’s repeat titrations? Range = [1]
- June 2018, Chemistry Paper 2 Foundation, Q8(d)(iii) (2 marks): Identify the outlier in the results of Jamal’s repeat titrations. Explain your choice. [2]
- June 2018, Chemistry Paper 2 Foundation, Q8(d)(iv) (3 marks): Use the repeat titration results to calculate the mean value for the volume of acid added. Give your answer to 3 significant figures. Mean value = cm3 [3]
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